Spring Chinook (Oncorhynchus tshawytscha) are an iconic species in the Willamette River Basin and are listed as threatened under the U.S. Endangered Species Act. The loss of many miles of complex channels and floodplain habitat in the Willamette River, dams, which create barriers and alter flow downstream, and warmer water from loss of riparian shade and reduced snow pack, have impacted Chinook salmon migration, reproductive success, and juvenile rearing.
This indicator measures the number of juvenile Chinook salmon.